Biology 322 human anatomy i
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Biology 322 Human Anatomy I. Autonomic Nervous System. Autonomic Nervous System. The efferent (motor) component of the peripheral nervous system includes two types of neurons: Neurons Neurons. Comparison: Somatic vs Autonomic efferent neurons.

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Biology 322 Human Anatomy I

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Biology 322 human anatomy i

Biology 322Human Anatomy I

Autonomic Nervous System


Biology 322 human anatomy i

Autonomic Nervous System


Biology 322 human anatomy i

The efferent (motor) component of the peripheral nervous system includes two types of neurons:

Neurons

Neurons


Biology 322 human anatomy i

Comparison: Somatic vs Autonomic efferent neurons

Somatic

Autonomic

Voluntary Involuntary

Effectors: Skeletal M. Effectors: Cardiac M.

Smooth M

Glands

Neurons extend from CNS to effectors without synapsing.

Two neurons to get from CNS to effectors;

Therefore one synapse.

"Two neuron chain"


Biology 322 human anatomy i

Autonomic Nervous System

Two divisions based on:

a)

b)


Biology 322 human anatomy i

Division of Autonomic Nervous System

Preganglionic neuron starts

Preganglionic neuron synapses

Division of Autonomic Nervous System

Preganglionic neuron starts

Preganglionic neuron synapses


Biology 322 human anatomy i

Sympathetic Division

Synapse between preganglionic neuron and postganglionic neuron can occur in either of two sets of ganglia

1)

  • .


Biology 322 human anatomy i

Sympathetic Ganglia


Biology 322 human anatomy i

Sympathetic Ganglia


Biology 322 human anatomy i

Parasympathetic Division

Synapse between preganglionic and postganglionic neurons occurs in ganglia very close to the target cells:

1.


Biology 322 human anatomy i

Parasympathetic Division

Synapse between preganglionic and postganglionic neurons occurs in ganglia very close to the target cells:

2.


Biology 322 human anatomy i

Parasympathetic Division

Synapse between preganglionic and postganglionic neurons occurs in ganglia very close to the target cells:

2.


Biology 322 human anatomy i

Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

Sympathetic:

Parasympathetic:


Biology 322 human anatomy i

Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

For example:

Heart:

Sympathetic increases heart rate & force of contraction

Parasympathetic decreases heart rate & force of contraction


Biology 322 human anatomy i

Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

For example:

(Heart: Sympathetic increases rate & force

Parasympathetic decreases rate & force )

Lungs:

Sympathetic dilates air passages

Parasynpathetic constricts air passages


Biology 322 human anatomy i

Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

For example:

(Heart: Sympathetic increases rate & force

Parasympathetic decreases rate & force )

(Lungs: Sympathetic dilates air passages

Parasynpathetic constricts air passages)

Digestive System:

Sympathetic decreases activity; constricts anal sphincter

Parasympathetic increases activity; relaxes anal sphincter


Biology 322 human anatomy i

Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

For example:

(Heart: Sympathetic increases rate & force

Parasympathetic decreases rate & force )

(Lungs: Sympathetic dilates air passages

Parasynpathetic constricts air passages)

(Digestive System: Sympathetic decreases activity

Parasympathetic increases activity)

Urinary System:

Sympathetic inhibits urination

Parasympathetic promotes urination


Biology 322 human anatomy i

Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

For example:

(Heart: Sympathetic increases rate & force

Parasympathetic decreases rate & force )

(Lungs: Sympathetic dilates air passages

Parasynpathetic constricts air passages)

(Digestive System: Sympathetic decreases activity

Parasympathetic increases activity)

(Urinary System: Sympathetic inhibits urination

Parasympathetic promotes urination)


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